Volumes have been stated on this topic, and the contention and discourse about where the "hot" slot machines are located in the casino are still on-going – 60 years after slot machine games were first placed in casinos.
The quintessential rule is that the very best slot games were located just inside the door of the casino; so that persons passing by would be able to see actual jackpot winners and be stirred to come unto the gambling floor … play. Our conclusion is that this is definitely no longer true.
Practically all of the mega casinos nowadays are colossal complexes and it’s no longer possible to see inside from the sidewalk, so there is no longer a reason to put the ‘loose’ slot machine games close-by any doors.
Another standard rule is that loose one armed bandits are located on the major aisles inside the casinos, again so that more fun seekers could see winning jackpots and be inspired to play. Nonetheless, we find that this also is no longer a universal rule.
What casinos found over the years is that people walking down the busy aisles were frequently on the way to somewhere else. If they played one armed bandits at all, they would simply put in their loose change because they happened to be walking by. Win or lose, they would very often not stop to keep playing. And the very last thing a casino wants is for someone to win a jackpot by playing only a few coins and then not stay to put it all back in!
Today, casinos are constantly changing their philosophy about where to place the loose one armed bandits.